银-铋修饰TiO<sub>2</sub>纳米材料可见光催化剂制备及降解甲醛性能分析

孙月吟; 黄琼; 周婕; 于小萌; 朱杰; 顾名扬; 徐笠芮; 杨波; 陶涛

doi:10.13205/j.hjgc.202302020

银-铋修饰TiO₂纳米材料可见光催化剂制备及降解甲醛性能分析

doi: 10.13205/j.hjgc.202302020

孙月吟¹,
黄琼^1, ,,
周婕¹,
于小萌¹,
朱杰¹,
顾名扬¹,
徐笠芮¹,
杨波¹,
陶涛²

1. 南京信息工程大学环境科学与工程学院江苏省大气环境与装备技术协同创新中心江苏省大气环境监测与污染控制高技术研究实验室, 南京 210044;
2. 南京信息工程大学化学与材料学院, 南京 210044

基金项目:

国家自然科学基金项目(21501097, 51902166)

江苏省自然科学基金(BK20201389, BK20190786, BK20170954)

江苏省高等学校"青蓝工程"和江苏省高等学校重点学科建设项目(PAPD)

详细信息

作者简介:
孙月吟(1997-),女,硕士,主要研究方向为光催化氧化技术。sunyueyin1018@163.com

通讯作者:
黄琼(1984-),男,副教授,主要研究方向为工业VOCs催化燃烧技术和光热协同催化氧化VOCs。hqhaixia@163.com

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出版历程
- 收稿日期: 2022-05-11
- 网络出版日期: 2023-05-25
- 刊出日期: 2023-02-01

PREPARATION OF VISIBLE LIGHT CATALYST AND PERFORMANCE ANALYSIS OF FORMALDEHYDE DEGRADATION OVER SILVER-BISMUTH MODIFIED TiO₂ NANOMATERIAL

1. Jiangsu Key Laboratory of Atmospheric Environmental Monitoring & Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies, School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2. School of Chemistry and Materials Science, Nanjing University of Information Science & Technology, Nanjing 210044, China

摘要

摘要: 预防和控制低浓度气态甲醛(HCHO)仍是室内环境污染所面临的巨大挑战之一,设计合成吸附能力强、催化氧化性能高、稳定性好的催化剂具有重要的实际应用价值。采用水热法和溶胶-凝胶法制备了一系列Ag-Bi共掺杂的纳米结构Ag/Bi-TiO₂光催化剂,用于在可见光、无动力条件下催化降解室内低浓度气态甲醛。并采用XRD、SEM、BET、H₂-TPR、UV-vis、XPS等技术对所制催化剂进行表征分析,考察了制备方法、Ag-Bi掺入量、煅烧温度等条件对催化剂可见光催化氧化性能的影响。结果发现:水热法制得的Ag/Bi-TiO₂-H催化剂降解甲醛效果最佳,其48h降解率可达到94.1%,可将浓度为1.076 mg/m³的甲醛降低至0.093 mg/m³,显著提升了TiO₂的催化氧化性能,其Ag₂O/Ag、Bi³⁺和TiO₂间的协同耦合作用改善了催化剂的微观结构,增强其对可见光的吸收,促进了光生电子的形成及转移。表面羟基以及耦合作用所形成的吸附氧提升了低浓度甲醛的吸附与催化氧化降解能力,且该催化剂展示出优异的稳定性能。
- 光催化氧化 /
- 甲醛 /
- 二氧化钛 /
- 掺杂 /
- 水热法
Abstract: The prevention and control of indoor low-concentration gaseous formaldehyde are still one of the great challenges faced by indoor environmental pollution. It is of great practical significance to design and synthesize catalysts with strong adsorption capacity, high catalytic oxidation performance and good stability. In this study, a series of Ag-Bi co-doped and nano-structured Ag/Bi-TiO₂ photocatalysts were synthesized by the hydrothermal method and sol-gel method, which were applied for catalytic degradation of formaldehyde under visible light and non-dynamic conditions. The catalysts were characterized by XRD, SEM, BET, H₂-TPR, UV-vis and XPS, and the effects of the preparation method, Ag-Bi incorporation amount and calcination temperatures on catalytic oxidation were investigated. The results showed that the Ag/Bi-TiO₂-H catalyst prepared by the hydrothermal method exhibited the best degradation effect of formaldehyde, which degradation rate reached 94.1% in 48 hours, and formaldehyde concentration reduced from 1.076 mg/m³ to 0.093 mg/m³, significantly improving the catalytic performance of TiO₂. The Ag₂O/Ag, Bi³⁺ and TiO₂ catalyst could be improved by coupling action between the microstructure, enhancing the absorption of visible light, to promote the formation of photoproduction electronics and their transferring. The surface hydroxyl and the adsorbed oxygen formed by coupling enhanced the adsorption and catalytic oxidation degradation of HCHO with low concentration. The possible principles of the catalysts were described, and the catalyst also showed excellent stability.
- photocatalytic oxidation /
- formaldehyde /
- TiO₂ /
- doping /
- hydrothermal method

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参考文献(46)

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